My opinion: the mask wearing by coaches and players, who have been in "the bubble" together and who will return to that same bubble, with 5 guys on the floor at a time interacting with each other and the other team, who will certainly bring back whatever germs or viruses they came into contact with during the game to that same bubble, is just to set an example for others to see. I don't believe the science would say the masks in this setting do any real good. That's why if anyone has the virus or can be contact traced to someone who has been exposed, will not even be in the building. I also think it's funny the teams can play, lay on, and sweat on each other for 40 minutes but can't shake hands or fist bump afterward. If you didn't catch it during the game, you're not gonna catch it during a post-game fist bump.